<!DOCTYPE html>
<html lang="zh-CN" xmlns="http://www.w3.org/1999/xhtml"
      xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>主页面</title>
</head>
<body>
    <h1>主页面123</h1>
    <form th:action="@{/logout}" method="post" th:method="post">
        <input type="submit" value="登出">
    </form>
</body>
</html>